Debt Coverage Ratio Calculator
Lender loan coverage check.
Calculate the debt service coverage ratio (DSCR) from net operating income and annual debt service — the lender's main rental-income litmus test.
What this tool does
Debt service coverage ratio (DSCR) measures whether a property's net operating income comfortably covers annual debt payments. This calculator divides your net operating income by annual debt service to produce a ratio that shows how many times over the property's earnings can pay down debt obligations in a year. A ratio of 1.25 or higher is common lending criteria. The result also illustrates the absolute cushion—the income remaining after debt payments are met. Net operating income and the size of annual debt service are the primary drivers of the outcome. This tool models typical income-property scenarios and is intended for educational illustration. It does not account for tax implications, variable interest rates, or changes in property performance over time.
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Formula Used
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Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
The debt service coverage ratio (DSCR) compares operating income to debt payments. Divide net operating income (NOI) by annual debt service. A DSCR of 1.25 means income covers debt payments by 25% margin. Lenders typically require minimum 1.20-1.25 for commercial loans; 1.40-1.50 for riskier property or business loans.
250k NOI against 200k annual debt service = 1.25 DSCR. Cushion is 50k - income can drop 20% before default. At 1.5 DSCR (same NOI, 167k service), cushion widens to 83k - income can drop 33% before breaching. Lenders price loans based on DSCR: higher DSCR means lower interest rates and more borrowing capacity.
DSCR below 1.0 means operating income doesn't cover debt payments - the business is losing money even before tax and owner draws. Banks call these loans immediately for breach, or restructure with stricter terms. Before taking a new loan, model DSCR under stress scenarios (20% revenue drop, 10% cost rise) to see if cover stays above 1.0.
A worked example
Try the defaults: net operating income of 250,000, annual debt service of 200,000. The tool returns 1.25. You can adjust any input and the result updates as you type — no submit button, no reload. That's the real power here: seeing how sensitive the output is to one or two assumptions.
What moves the number most
The result responds to Net Operating Income and Annual Debt Service. Not every input has equal weight. Adjusting one input at a time toward extreme values shows which ones move the result most.
The formula behind this
DSCR = NOI ÷ annual debt service. Cushion = NOI - debt service. Everything the calculator does is shown in the formula box below, so you can check the math against your own spreadsheet if you want.
What the score tells you
Headline financial numbers — income, savings, debt — each tell part of the story. This calculation stitches several together into a single read you can track over time. The value is in the direction, not the absolute number.
What this doesn't capture
The score is a composite of the inputs you provide. Life context — job security, family obligations, health, housing — doesn't appear in the math but shapes the real picture. Use the number as a prompt, not a verdict.
££250,000 NOI ÷ ££200,000 debt service = 1.25.
Inputs
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
This calculator computes the debt service coverage ratio by dividing net operating income by annual debt service payments. The result indicates how many times over the business generates sufficient income to cover its debt obligations. A ratio above 1.0 means income exceeds debt service; below 1.0 means a shortfall. The calculator also derives the absolute cushion—the remaining income after debt service is paid—by subtracting annual debt service from net operating income. The model assumes net operating income and debt service figures remain constant over the period measured, and treats them as the sole determinants of coverage capacity. It does not account for seasonality, variable cash flows, refinancing risk, changes in interest rates, or the timing of cash inflows and outflows within the period.
References
Frequently Asked Questions
What DSCR do lenders require?
Is DSCR the same as debt-to-equity?
What counts as operating income?
DSCR drops below 1.0 - what happens?
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